// Title: Timestamp picker
// Description: See the demo at url
// URL: http://us.geocities.com/tspicker/
// Script featured on: http://javascriptkit.com/script/script2/timestamp.shtml
// Version: 1.0
// Date: 12-05-2001 (mm-dd-yyyy)
// Author: Denis Gritcyuk <denis@softcomplex.com>; <tspicker@yahoo.com>
// Notes: Permission given to use this script in any kind of applications if
//    header lines are left unchanged. Feel free to contact the author
//    for feature requests and/or donations
var gCallbackfn = "";
function show_calendar(str_target, str_datetime,return_time,year) {
	
	var arr_months = ["January", "February", "March", "April", "May", "June",
		"July", "August", "September", "October", "November", "December"];
	var week_days = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"];
	var n_weekstart = 1; // day week starts from (normally 0 or 1)
	var lreturn_time = return_time || "Y";
	var dt_datetime = (str_datetime == null || str_datetime =="" ?  new Date() : str2dt(str_datetime));
	var new_year = year || "";
	
	callbackfn = gCallbackfn;
	if(isNaN(year)) year=dt_datetime.getYear();
	
	if(new_year !="") dt_datetime.setYear(year);
	var dt_prev_month = new Date(dt_datetime);
	dt_prev_month.setMonth(dt_datetime.getMonth()-1);
	var dt_next_month = new Date(dt_datetime);
	dt_next_month.setMonth(dt_datetime.getMonth()+1);
	var dt_firstday = new Date(dt_datetime);
	dt_firstday.setDate(1);
	dt_firstday.setDate(1-(7+dt_firstday.getDay()-n_weekstart)%7);
	var dt_lastday = new Date(dt_next_month);
	dt_lastday.setDate(0);
	
	
	// html generation (feel free to tune it for your particular application)
	// print calendar header
	
	var seltime = "''";
	//if(lreturn_time=="Y") seltime = " ' ' + document.cal.time.value" ;
	var str_buffer = new String (
		"<html>\n"+
		"<head>\n"+
		"	<title>Calendar</title>\n"+
		"	<style>\n"+
		"		td,tr{}\n"+
		"		input{border:1px solid silver;font-size:8pt;}\n"+
		"		body{margin:0padding:0;background-color:#87CEFA;}\n"+
		"		a{color:white;text-decoration:none}\n"+
		"	</style>\n"+
		"	<script> \n" +
		"		function changeYear(new_year) {\n" +
		"			\n" +	
		"			window.opener.show_calendar('" +str_target+"', '"+  dt2dtstr(dt_next_month)+" '+document.cal.time.value,'Y',new_year)\n" +
		"		} \n " +
		"		function checkint(eventObj,obj){ \n" +
		"			var keyCode; \n" +
		"			var str=obj.value; \n " +
		"		 \n" +
		"			if (document.all){keyCode=eventObj.keyCode;} \n" +
		"			else{keyCode=eventObj.which;}  \n" +
		"		 \n" +
		"			if(keyCode==46){return false} \n" +
		"			if((keyCode<48 || keyCode >58)   &&   (keyCode != 46) && (keyCode != 13)){return false} \n" +
		"			return true ; \n" +
		"		} \n" +
		"	</script> \n" +
		"</head>\n"+
		"<body>\n"+
		"<table class=\"clsOTable\" cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
		"<tr><td bgcolor=\"lightblue\">\n"+
		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n	<td align='center' bgcolor=\"#4682B4\"><a href=\"javascript:window.opener.show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_prev_month)+" '+document.cal.time.value);\">"+
		"&#171;</a></td>\n"+
		"	<td bgcolor=\"#4682B4\" colspan=\"5\" align='center'>"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"1\">"
		+arr_months[dt_datetime.getMonth()]+ " " + dt_datetime.getFullYear() + " </font></td>\n"+
		"	<td bgcolor=\"#4682B4\" align=\"center\"><a href=\"javascript:window.opener.show_calendar('"
		+str_target+"', '"+dt2dtstr(dt_next_month)+" '+document.cal.time.value);\">"+
		"&#187;</a></td>\n</tr>\n"
	);

	var dt_current_day = new Date(dt_firstday);
	// print weekdays titles
	str_buffer += "<tr>\n";
	for (var n=0; n<7; n++)
		str_buffer += "	<td bgcolor=\"#87CEFA\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"1\">"+
		week_days[(n_weekstart+n)%7]+"</font></td>\n";
	// print calendar table
	str_buffer += "</tr>\n";
	while (dt_current_day.getMonth() == dt_datetime.getMonth() ||
		dt_current_day.getMonth() == dt_firstday.getMonth()) {
		// print row heder
		str_buffer += "<tr>\n";
		for (var n_current_wday=0; n_current_wday<7; n_current_wday++) {
				if (dt_current_day.getDate() == dt_datetime.getDate() &&
					dt_current_day.getMonth() == dt_datetime.getMonth())
					// print current date
					str_buffer += "	<td bgcolor=\"#FFB6C1\" align=\"right\">";
				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
					// weekend days
					str_buffer += "	<td bgcolor=\"#DBEAF5\" align=\"right\">";
				else
					// print working days of current month
					str_buffer += "	<td bgcolor=\"white\" align=\"right\">";

				if (dt_current_day.getMonth() == dt_datetime.getMonth())
					// print days of current month
					str_buffer += 	"<a href=\"javascript:window.opener."+
									str_target+
									".value='"+
									dt2dtstr(dt_current_day) +
									"' + " + seltime + "; " + callbackfn + "; window.close();\">"+
					"<font color=\"black\" face=\"tahoma, verdana\" size=\"1\">";
    else 
					// print days of other months
					str_buffer += "<a href=\"javascript:window.opener."+str_target+
					".value='"+dt2dtstr(dt_current_day)+" '; window.close();\">"+
					"<font color=\"gray\" face=\"tahoma, verdana\" size=\"1\">";
				str_buffer += dt_current_day.getDate()+"</font></a></td>\n";
				dt_current_day.setDate(dt_current_day.getDate()+1);
		}
		// print row footer
		str_buffer += "</tr>\n";
	}
	// print calendar footer
	str_buffer +=
		"<form name=\"cal\">\n<tr><td colspan=\"7\" bgcolor=\"#87CEFA\">"+
		"<font color=\"White\" face=\"tahoma, verdana\" size=\"1\">"+
		"<input type=\"hidden\" name=\"time\" value=\""+dt2tmstr(dt_datetime)+
		"\" size=\"8\" maxlength=\"8\"></font></td></tr>\n</form>\n" +
		"</table>\n" +
		"</tr>\n</td>\n</table>\n" +
		"</body>\n" +
		"</html>\n";

	var vWinCal = window.open("", "Calendar", 
		"width=240,height=220,status=no,resizable=yes,top=200,left=200");
	vWinCal.opener = self;
	var calc_doc = vWinCal.document;
	calc_doc.write (str_buffer);
	calc_doc.close();
}
// datetime parsing and formatting routimes. modify them if you wish other datetime format
function str2dt (str_datetime) {
	var re_date = /^(\d+)\/(\d+)\/(\d+)\s+(\d+)\:(\d+)\:(\d+)$/;
	if(str_datetime.length<11) str_datetime = str_datetime + " " + dt2tmstr(new Date());
		
	if (!re_date.exec(str_datetime)){
		var now =new Date();
		str_datetime=dt2dtstr(now) + " " + dt2tmstr(now);
	}	
	
	if (!re_date.exec(str_datetime))
		return alert("Invalid Datetime format: "+ str_datetime);
		
	return (new Date (RegExp.$3, RegExp.$2-1, RegExp.$1, RegExp.$4, RegExp.$5, RegExp.$6));
}
function dt2dtstr (dt_datetime) {
	var month = dt_datetime.getMonth()+1;
	if(month<10) month="0"+month;
	
	var day =	dt_datetime.getDate()  ;
	if(day<10) day="0"+day;
	var year = dt_datetime.getFullYear();
	
	return (new String (
			day+"/"+month+"/"+year+""));
}
function dt2tmstr (dt_datetime) {
	var h = dt_datetime.getHours();
	if(h<10) h="0"+h;
	
	var m = dt_datetime.getMinutes();
	if(m<10)m="0"+m;
	
	var s = dt_datetime.getSeconds();
	if(s<10) s="0"+s;
	
	return (new String (h+":"+ m +":"+ s));
}

